ohh, we will try! the thing is the font would have to be pixel anyway and no bigger than 12 px height, and width of the buttons also pretty tight
Just came across this, it looks pretty mesmerizing!
I recommend Fusion Pixel Font for 12x12 Traditional and Simplified Chinese characters. It's very readable and should cover most or all of the ones you'll need. It also covers Korean (using Galmuri, a good Korean/Japanese Kana font) and its own Japanese Kana if you need it.